Acquiring Waveforms
3-32
TDS5000 Series User Manual
Sample interval
First s ampled and digitized
point in record
Horizontal reference
Trigger point
Horizontal delay
Record length
Horizontal position
Figure 3- 11: The waveform record and its defining parameters (horizontal delay on)
As Figure 3--11 shows, the oscilloscope acquires points in order from left to
right.
When all of the points in the waveform record have been sampled and digitized,
the waveform record is stored in acquisition memory and becomes available for
display (or use in math waveforms, storage, and so on).
For a control-oriented discussion of the waveform record, refer to Horizontal
Acquisition Window Considerations on page 3--18 and Horizontal Scale vs.
Record Length vs. Sample Interval vs. Resolution on page 3--19.
The two general methods of sampling are real-time and equivalent-time. This
oscilloscope uses both equivalent- and real-time sampling.
In real-time sampling, the oscilloscope digitizes all of the points it acquires after
one trigger event (see Figure 3--12). Always use real-time sampling to capture
single-shot or transient events.
Sampling rate
Record points
Figure 3- 12: Real-time sampling
Real-time Sampling
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